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NOTE: Standard size mandrel is ¼" diameter x 1½" long. Information on other mandrel diameters, lengths, and speeds are available upon request or from the American National Standards Institute Safety Code B7.1. |
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| SHAPE | DIAMETER inches |
THICKNESS inches |
OVERHANG 1/2" & THD MDRLS |
 A1 |
3/4 | 2-1/2 | 19800 |
 A2 |
1 | 1-1/4 | 38200 |
 A3 |
1 | 2-3/4 | 16100 |
 A4 |
1-1/4 | 1-1/4 | 30560 |
 A5 |
3/4 | 1-1/8 | 45000 |
 A6 |
3/4 | 1-1/8 | 39000 |
 A11 |
7/8 | 2 | 19860 |
 A12 |
11/16 | 1-1/4 | 48000 |
 A13 |
1-1/8 | 1-1/8 | 33950 |
 A14 |
11/16 | 7/8 | 55560 |
 A15 |
1/4 | 1-1/16 | 72750 |
 A21 |
1 | 1 | 34500 |
 A22 |
3/4 | 5/8 | 50930 |
 A23 |
3/4 | 1 | 39370 |
 A24 |
1/4 | 3/4 | 76500 |
| A25 |
1 | 1 | 35620 |
 A26 |
5/8 | 5/8 | 61120 |
 A31 |
1-3/8 | 1 | 27780 |
 A32 |
1 | 5/8 | 38200 |
 A33 |
1 | 1/2 | 38200 |
 A34 |
1-1/2 | 3/8 | 25470 |
 A35 |
1 | 3/8 | 38200 |
 A36 |
1-5/8 | 3/8 | 23520 |
 A37 |
1-1/4 | 1/4 | 30560 |
 A38 |
1 | 1 | 34500 |
 A39 |
3/4 | 3/4 | 47250 |
 A40 |
3/4 | 3/4 | 47250 |